01 - Preheat oven to 350°F. Grease a 9x5-inch loaf pan and line with parchment paper for easy removal.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, salt, and poppy seeds until evenly distributed.
03 - In a large bowl, combine granulated sugar and lemon zest. Rub together with fingertips to release citrus oils until fragrant.
04 - Whisk melted butter, eggs, milk, lemon juice, and vanilla extract into the sugar mixture until smooth and well blended.
05 - Gently fold the dry ingredients into the wet mixture just until combined. Do not overmix to maintain tender texture.
06 - Transfer batter to the prepared loaf pan and smooth the top with a spatula for even baking.
07 - Bake for 45–55 minutes until a toothpick inserted in the center emerges clean or with moist crumbs.
08 - Allow the loaf to rest in the pan for 10 minutes to set before transferring to a wire rack.
09 - Whisk powdered sugar with fresh lemon juice until smooth and pourable, adjusting consistency as needed.
10 - Drizzle glaze over the completely cooled loaf. Allow glaze to set before slicing into 8 servings.